package com.dailywork.basepro.thread.concurrent.concurrent;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.StampedLock;

/**
 * @author Benjamin Winterberg
 */
public class Lock4 {

    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(2);

        Map<String, String> map = new HashMap<>();

        StampedLock lock = new StampedLock();

        executor.submit(
                () -> {
                    long stamp = lock.writeLock();
                    try {
                        ConcurrentUtils.sleep(1);
                        map.put("foo", "bar");
                    } finally {
                        lock.unlockWrite(stamp);
                    }
                });

        Runnable readTask =
                () -> {
                    long stamp = lock.readLock();
                    try {
                        System.out.println(map.get("foo"));
                        ConcurrentUtils.sleep(1);
                    } finally {
                        lock.unlockRead(stamp);
                    }
                };
        executor.submit(readTask);
        executor.submit(readTask);

        ConcurrentUtils.stop(executor);
    }
}
